Question

boys are holding a debate in the school hall change to passive voice

Answer 1

A debate is being held by the boys in the school hall.

Answer 2

Heya !!

Here is your answer..

A debate is being held in the school hall for boys.

OR

A debate is being held for boys in the school hall.

Explanation :

While changing the voice into passive, 'are holding' is changed to 'is being held'.

And also while changing the tense of the sentence is changed.

The only thing we do is to replace the subject and object.

Hope it helps.